Is it possible to save certain parts of a screenshot
This answer is given with assumption that you would like to save different windows screen shot only.

Here are the steps to take screenshots of specific windows in Blender e.g 3dView, UV Windows, Properties.


Hover your mouse over required window.
Press Ctrl + F3.
Before saving screen shot, Uncheck Full Screen box to save only specific windows shot. It is available in Save Screenshot Properties Box.